Siemens 1FK7022-5AK71-1LG5 System-Ready Servo Motor for SIMOTICS S Architecture

Siemens 1FK7022-5AK71-1LG5 System-Ready Servo Motor for SIMOTICS S Control Architecture

In modern industrial automation, a servo motor is never a standalone component — it is a precision node within a layered control architecture. The Siemens 1FK7022-5AK71-1LG5, part of the SIMOTICS S synchronous servo motor family, is engineered to operate as a tightly integrated element within Siemens’ SINAMICS drive platform, delivering deterministic torque response, high dynamic positioning accuracy, and long-term mechanical reliability across demanding industrial environments. Understanding this motor’s role requires examining the full system stack: from the controller layer down through the drive, motor, and mechanical execution layer, and back up through the feedback and network layers that close the control loop.

The 1FK7022-5AK71-1LG5 is a compact, low-inertia servo motor designed for high-cycle applications where rapid acceleration and deceleration are critical. Its permanent magnet synchronous design ensures high efficiency and consistent torque output across the speed range, making it well-suited for integration into multi-axis coordinated motion systems. The motor’s encoder interface — encoded in the suffix structure — supports high-resolution position feedback, enabling the SINAMICS S120 drive system to execute precise closed-loop vector control without positional drift or velocity ripple.

Architecture Specification Table

Coordinated Control System Design

The 1FK7022-5AK71-1LG5 achieves its full performance potential only when correctly paired within a coherent Siemens drive system. At the controller layer, a SIMATIC S7-1500 CPU — such as the CPU 1516-3 PN/DP — provides the motion control kernel, executing PLC Open-compliant motion function blocks that command axis position, velocity, and torque profiles. The S7-1500 communicates with the drive layer via PROFINET IRT (Isochronous Real-Time), ensuring cycle-synchronous setpoint transmission with sub-millisecond jitter.

At the drive layer, the SINAMICS S120 booksize drive system serves as the power and control interface for the 1FK7022-5AK71-1LG5. A typical multi-axis configuration uses a SINAMICS S120 Active Line Module (ALM) for regenerative energy recovery, paired with one or more Motor Modules in booksize format. The DRIVE-CLiQ interface — a proprietary Siemens digital communication link — connects the motor’s encoder directly to the Motor Module, eliminating the need for separate encoder cables and enabling automatic motor identification (SIZER-based parameterization). This reduces commissioning time significantly and eliminates manual encoder configuration errors.

For applications requiring axis redundancy or safe motion, the SINAMICS S120 Safety Integrated functions — including STO (Safe Torque Off), SS1 (Safe Stop 1), and SLS (Safely Limited Speed) — can be activated without additional safety hardware, provided the 1FK7022-5AK71-1LG5 is paired with a Safety-capable Motor Module. The SIMATIC ET 200SP distributed I/O system, connected via PROFINET, handles digital and analog field signals — limit switches, proximity sensors, and analog feedback — that feed into the motion control logic running on the S7-1500.

At the network layer, a SCALANCE X208 managed Ethernet switch provides the PROFINET backbone, supporting ring topology for media redundancy (MRP). This ensures that a single cable fault does not interrupt the real-time communication between the S7-1500 and the SINAMICS S120 drive, maintaining axis synchronization across the entire machine. For human-machine interface, a SIMATIC HMI TP1200 Comfort Panel provides the operator with real-time axis status, alarm management, and recipe-based parameter switching — all integrated through the TIA Portal engineering framework.

Power distribution to the 1FK7022-5AK71-1LG5 system is managed through a SITOP PSU8600 modular power supply, which provides 24 VDC control voltage to the SIMATIC S7-1500, ET 200SP I/O modules, and SCALANCE network components. The SINAMICS S120 drive draws its DC bus power from the Active Line Module, which rectifies the incoming three-phase AC supply and maintains a stable DC link voltage for all connected Motor Modules. Terminal connections between the control cabinet and field devices are managed through SIRIUS 3RT contactors and 3RV circuit breakers, providing motor protection and safe isolation during maintenance.

Application in Layered Automation Systems

The 1FK7022-5AK71-1LG5 is deployed across a wide range of industrial sectors where compact, high-dynamic servo performance is required within a Siemens-native control architecture.

In packaging machinery, this motor drives cam-synchronized axes — infeed conveyors, sealing jaws, and labeling heads — where the SINAMICS S120 electronic cam (ECAm) function replaces mechanical gearboxes, enabling rapid format changeover without physical retooling. The motor’s low inertia and high peak torque ratio allow it to follow complex cam profiles at line speeds exceeding 200 cycles per minute.

In machine tool and CNC applications, the 1FK7022-5AK71-1LG5 serves as a feed axis motor for small-to-medium machining centers, where the SINAMICS S120 vector control mode delivers the stiffness and bandwidth required for contouring accuracy. The DRIVE-CLiQ encoder feedback ensures that the S7-1500 motion controller receives position data with sub-micron resolution, supporting tight geometric tolerances in multi-axis interpolation.

In process automation and chemical/petrochemical plants, the motor is used in dosing and metering systems where precise volumetric control is critical. The PROFINET integration allows the drive to receive setpoints from a distributed control system (DCS) or SCADA platform, enabling seamless integration into plant-wide process control architectures without protocol conversion gateways.

In water treatment and utilities, the motor drives pump and valve actuator systems where energy efficiency and remote diagnostics are priorities. The SINAMICS S120’s built-in energy monitoring functions, accessible via the TIA Portal, allow plant engineers to track motor efficiency trends and schedule predictive maintenance before mechanical wear causes unplanned downtime.

In metallurgy and heavy industry, the 1FK7022-5AK71-1LG5 is used in auxiliary positioning axes — coil handling, strip tension control, and roll gap adjustment — where the motor’s robust IP64 protection and Class F insulation ensure reliable operation in high-temperature, high-vibration environments.

Architecture Engineering FAQ

Q1: Is the 1FK7022-5AK71-1LG5 compatible with both SINAMICS S120 and SINAMICS S210 drive systems?
Yes. The 1FK7022-5AK71-1LG5 is natively compatible with the SINAMICS S120 booksize and chassis drive systems via DRIVE-CLiQ. It is also compatible with the SINAMICS S210 single-axis servo drive, which is designed specifically for compact 1FK2 and 1FK7 series motors. When using the S210, the motor is automatically identified via DRIVE-CLiQ, and the drive’s integrated safety functions (STO, SS1) are available without additional hardware. Confirm the motor’s power rating against the selected Motor Module’s output current to ensure correct sizing.

Q2: What commissioning steps are required when integrating this motor into an existing SIMATIC S7-1500 motion control project?
Integration follows the standard TIA Portal V17+ workflow: add the SINAMICS S120 drive object to the project, configure the Motor Module with the 1FK7022-5AK71-1LG5 motor data set (automatically loaded via DRIVE-CLiQ identification), assign the axis to a TO_PositioningAxis or TO_SynchronousAxis technology object, and configure the encoder interface. PROFINET IRT must be enabled on both the S7-1500 and the SINAMICS S120 CU320-2 PN Control Unit for isochronous operation. After download, perform a drive optimization run (speed controller optimization) to tune the current and speed control loops to the connected mechanical load.

Q3: What does the 12-Month Warranty cover, and how is it supported for international customers?
The 12-Month Warranty covers manufacturing defects, encoder failure, winding insulation breakdown, and bearing failure under normal operating conditions from the date of shipment. It does not cover damage resulting from incorrect installation, overvoltage events, or operation outside the motor’s rated parameters. For international customers, warranty claims are processed through ZYPLC’s technical support team. Replacement units are dispatched from verified stock, and failed units are accepted for return within the warranty period. Contact +86 19859288691 or plc.sales@zyplc.com to initiate a warranty claim or request a pre-shipment test report.

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